[Bug debug/61033] [4.8/4.9 Regression] Infinite loop in variable tracking

[cbaylis at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61033

--- Comment #6 from cbaylis at gcc dot gnu.org ---

git bisect points to r211625 as the revision which fixes/hides this bug on
trunk.

2014-06-13  Richard Biener  <rguenther@suse.de>

        * tree-ssa-pre.c (eliminate_dom_walker::before_dom_children):
        Rewrite to propagate the VN result into all uses where
        possible and to remove stmts becoming dead because of that.
        (eliminate): Generalize stmt removal handling, remove in
        reverse dominator order to support proper debug stmt
        generation.  Update stmts before removing stmts.
        * tree-ssa-propagate.c (propagate_tree_value): Remove
        bogus assert.